/*
 * Copyright (c) 2007 Team and Concepts Limited.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Team and Concepts Limited nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TEAM AND CONCEPTS LIMITED ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL TEAM AND CONCEPTS LIMITED BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.editgrid.api.client;

import java.io.*;
import java.util.*;
import org.apache.commons.lang.StringEscapeUtils;

public class XmlWriter {
	private Writer writer;
	private Stack<String> elementStack;
	private boolean tagOpen = false;
	
	public XmlWriter(Writer writer) {
		this.writer = writer;
		this.elementStack = new Stack<String>();
	}
	
	public void writeStartElement(String element) throws IOException {
		this.writeStartElement(null, element);
	}
	
	public void writeStartElement(String prefix, String element) throws IOException {
		if (tagOpen) {
			this.writer.write(">\n");
			tagOpen = false;
		}
		StringBuilder fullname = new StringBuilder();
		if (prefix != null && !"".equals(prefix)) {
			fullname.append(prefix);
			fullname.append(':');
		}
		fullname.append(element);
		this.writer.write('<');
		this.writer.write(fullname.toString());
		this.elementStack.push(fullname.toString());
		tagOpen = true;
	}
	
	public void writeAttributeString(String attribute, String value) throws IOException {
		this.writeAttributeString(null, attribute, value);
	}
	
	public void writeAttributeString(String prefix, String attribute, String value) throws IOException {
		StringBuilder fullname = new StringBuilder();
		if (prefix != null && !"".equals(prefix)) {
			fullname.append(prefix);
			fullname.append(':');
		}
		fullname.append(attribute);
		this.writer.write(' ');
		this.writer.write(fullname.toString());
		this.writer.write("=\"");
		StringEscapeUtils.escapeXml(writer, value);
		this.writer.write('"');
	}
	
	public void writeEndElement() throws IOException {
		this.writer.write("</");
		this.writer.write(elementStack.pop());
		this.writer.write(">\n");
	}
	
	public void writeString(String s) throws IOException {
		if (tagOpen) {
			this.writer.write(">");
			tagOpen = false;
		}
		StringEscapeUtils.escapeXml(writer, s);
	}
	
	public void close() throws IOException {
		this.writer.close();
	}
}
